Bernedict Evans, one of the mot inspiring people in my twitter timeline, has put together a must read list of 16 theses on the state of mobile in 2015 and some development he thinks will happen in the near future: http://ben-evans.com/benedictevans/2015/12/15/16-mobile-theses
A nice read about design strategies for mobile devices.
If you need some number about the growth or usage of mobile for your presentation, this is the site to start with
Interactive Charts about mobile internet usage in different countries of the world
really useful resource if you need some numbers on the mobile market and usage data
Well Mr Zuckerberg. Maybe before blaming a technology for your app being too slow your developers should learn how to use it properly :p